Triplet correlations in two-dimensional colloidal model liquids

Details Triplet correlations in two-dimensional colloidal model liquids Triplet correlations in two-dimensional colloidal model liquids

2003-07-23

arxiv.org/abs/cond-mat/0307561v1

Physics

Condensed Matter

Soft Condensed Matter

many pages, 8 figures, contribution to the special issue in J.Phys. Cond. Mat. of the CECAM meeting in LYON ''Many-body....''

Scientific paper

10.1088/0953-8984/15/48/011

Three-body distribution functions in classical fluids have been theoretically investigated many times, but have never been measured directly. We present experimental three-point correlation functions that are computed from particle configurations measured by means of video-microscopy in two types of quasi-two-dimensional colloidal model fluids: a system of charged colloidal particles and a system of paramagnetic colloids. In the first system the particles interact via a Yukawa potential, in the second via a potential $\Gamma/r^{3}$. We find for both systems very similar results: on increasing the coupling between the particles one observes the gradual formation of a crystal-like local order due to triplet correlations, even though the system is still deep inside the fluid phase. These are mainly packing effects as is evident from the close resemblance between the results for the two systems having completely different pair-interaction potentials.

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